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GM recalls 3.8 million vehicles in North America due to braking issue

WASHINGTON — General Motors Co said Wednesday it was recalling 3.46 million U.S. pickup trucks and SUVs to address a vacuum pump issue that could make braking more difficult and that has been linked to 113 accidents and 13 injuries. The recall covers 2014-2018 model year vehicles, including some Cadillac Escalade, Chevrolet Silverado, Chevrolet Tahoe, GMC Sierra, Chevrolet Suburban and GMC Yukon vehicles. In late June, GM recalled 310,000 vehicles in Canada for the same issue. GM did not immediately explain why the Canadian recall occurred more than two months before it called back the vehicles in the United States. The recall was triggered because the amount of vacuum created by the vacuum pump may decrease over time, GM told the National Highway Traffic Safety Administration (NHTSA) in documents posted on Wednesday. The NHTSA opened a preliminary investigation into the issue last November, and said it had reports of nine related crashes and two injuries. It provided GM in July with additional field reports that prompted the automaker to open an investigation. GM said it could affect braking in "rare circumstances." The NHTSA said in a statement the "vehicles may experience brake boost failure, which would require increased brake pedal effort, leading to a hard brake pedal feel, and potentially increased stopping distance." GM said dealers will reprogram the electronic brake control module to improve how the system utilizes the hydraulic brake boost assist function when vacuum assist is depleted. GM said the vacuum assist pump, which is lubricated with engine oil that flows into the pump through a filter screen, can in some cases lose effectiveness over time, as debris such as oil sludge can accumulate on the filter screen. GM told NHTSA that prior model years used a different brake assist system design, and vehicles manufactured after 2018 were not equipped with the affected pump design. Separately, GM said on Wednesday it is recalling 270,000 additional U.S. vehicles in three smaller recalls, including 177,000 2018 Chevrolet Malibu cars with 1.5L turbo engines because an error in the engine control module software may result in the fuel injectors being disabled.

2022 GMC Sierra spotted with minimal camouflage

By all accounts, GM's current full-size truck twins, the Chevrolet Silverado and GMC Sierra, are good trucks that are in many ways competitive with the sales-leading Ford F-150 and a fresh Ram 1500 that's regularly nipping at the Bowtied truck's tailgate. Considering the cashflow generated by the segment, though, it's no surprise to see a refreshed version of the GMC Sierra testing with some light camouflage hiding some of the upgraded bits and pieces. We'll get to what we can see in just a moment, but first we'll point out what we can't see in these spy shots. What the GM pair really needs is a competitive interior. The current Silverado and Sierra are bridled by dashboards, door panels and instrument clusters that simply aren't good enough when compared to their Ram and Ford competitors. We've spoken with a few designers from GM, and they are well aware of the criticisms that have been levied at their full-size truck duo, so we'd be shocked if there wasn't a heavily revised interior lurking for the trucks' next refresh. Hopefully a future set of spy photos will give us a better look at what's inside, because from this far-away, through-the-windshield look doesn't give us much information. Will the Sierra share an interior with the redesigned Yukon? We'll just have to wait and see, but suffice it to say that any improvement will be welcome. Moving to the exterior, we can clearly see that the blocky, angular look of the current Sierra will continue through this refresh. A tiny look through the heavy tarp covering the truck's face reveals a black plastic mesh grille, but we're sure there's plenty of chrome hiding under there, too. We're left to wonder if that opening allows for a camera or radar to peek through, but rumors suggest GM's well-regarded Super Cruise could be on the menu within the next few years. We have no idea what's under this test truck's hood, but we wouldn't imagine there will be much change to the current truck's solid list of powertrain options. Here's hoping the 3.0-liter Duramax inline-six diesel engine gets the cooling it needs to raise its tow rating to match its class-leading efficiency, because it's arguably otherwise the best light-duty diesel offering in America. We know the automaker is working on electric powertrains, too, but we expect to see those debut first in the Hummer-branded truck that will be sold in GMC dealerships.

GMC Sierra Denali CarbonPro bed is finally, almost here

GMC revealed the Sierra 1500 with the optional CarbonPro bed on March 1, 2018. The bed wasn't available at launch, though. You can't buy it now, either, but it will hit dealerships with limited availability after production starts in early June, exclusively for the Denali 1500 and AT4 1500 trims. The carbon floor and sides replace the steel panels in a normal bed, providing "strength, durability, and scratch resistance" and a potential 59-pound weight saving, depending on the truck's configuration. To make sure the bed had a chance, development engineers replicated "extreme use scenarios" like dropping 1,800-pound gravel loads, 450-pound steel drums, and cinder blocks from various heights. They put a 250-pound man on a snowmobile with studded tracks, had him drive into the bed and then go wide-open throttle. We're told the result was "minimal scratching." On top of the extreme weather testing any vehicle goes through, the team also put a generator in the bed and aim the exhaust into a corner to ensure vibration and direct heat wouldn't deform the carbon fiber. Because of the finer shaping area-specific strength possible with carbon fiber, the bed provides one cubic foot of additional payload space by having its sidewalls pushed further out. The CarbonPro bed doesn't need a bedliner, and is grained at the top for better traction but smooth on the bottom for easier hosing down and dirt removal. Tie-downs at the front of the bed work with molded indentations to hold motorcycle tires, and slots in the sidewalls hold two-by-sixes. The truck maker says the carbon-lined payload area confers "best-in-class dent, scratch and corrosion resistance," but we suppose the nation's pickup truck army will prove that or not. The trucks likely won't have the hardest life at the start, since the Sierra Denali costs $56,790 before even a basic option like four-wheel drive. The real test probably won't come until around 2029, when third owners begin treating their aerospace-inspired thoroughbreds like dray horses.